| | 1 | #include <linux/module.h> |
| | 2 | #include <linux/device.h> |
| | 3 | #include <linux/platform_device.h> |
| | 4 | #include <linux/gpio_event.h> |
| | 5 | |
| | 6 | #define PREFIX "debounce: " |
| | 7 | |
| | 8 | static int debounce_delay = 10; |
| | 9 | |
| | 10 | static int old_delay = 0; |
| | 11 | static struct gpio_event_matrix_info *gpio_evmi = NULL; |
| | 12 | |
| | 13 | module_param(debounce_delay, int, S_IRUSR | S_IRGRP | S_IROTH); |
| | 14 | MODULE_PARM_DESC(debounce_delay, "debouncing delay (ms), default: 10"); |
| | 15 | |
| | 16 | static int find_ms2_dev(struct device *dev, void *data) |
| | 17 | { |
| | 18 | if (!strncmp((char*)data, dev_name(dev), strlen((char*)data))) { |
| | 19 | printk(KERN_INFO PREFIX "Found it\n"); |
| | 20 | return 1; |
| | 21 | } |
| | 22 | return 0; |
| | 23 | } |
| | 24 | |
| | 25 | static int __init debounce_init(void) |
| | 26 | { |
| | 27 | struct device *event_dev = NULL; |
| | 28 | struct gpio_event_platform_data *gpio_epd; |
| | 29 | struct gpio_event_info *gpio_ei; |
| | 30 | |
| | 31 | printk(KERN_INFO PREFIX "Searching for " GPIO_EVENT_DEV_NAME "...\n"); |
| | 32 | |
| | 33 | |
| | 34 | event_dev = device_find_child(&platform_bus, GPIO_EVENT_DEV_NAME, find_ms2_dev); |
| | 35 | if (event_dev == NULL) |
| | 36 | return -ENODEV; |
| | 37 | |
| | 38 | gpio_epd = (struct gpio_event_platform_data*)event_dev->platform_data; |
| | 39 | printk(KERN_INFO PREFIX "And there is a %s connected...\n", gpio_epd->name); |
| | 40 | if (strcmp(gpio_epd->name, "sholes-keypad")) |
| | 41 | return -ENODEV; |
| | 42 | |
| | 43 | gpio_ei = (struct gpio_event_info*)gpio_epd->info[0]; |
| | 44 | gpio_evmi = container_of(gpio_ei, struct gpio_event_matrix_info, info); |
| | 45 | |
| | 46 | printk(KERN_INFO PREFIX "settle_time: %u\n", gpio_evmi->settle_time.tv.nsec); |
| | 47 | printk(KERN_INFO PREFIX "poll_time: %u\n", gpio_evmi->poll_time.tv.nsec); |
| | 48 | printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec); |
| | 49 | printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags); |
| | 50 | |
| | 51 | /* GPIOKPF_DEBOUNCE should already be set by GPIOKPF_REMOVE_PHANTOM_KEYS */ |
| | 52 | if (!(gpio_evmi->flags & GPIOKPF_DEBOUNCE)) { |
| | 53 | printk(KERN_INFO PREFIX "Activating debounce\n"); |
| | 54 | gpio_evmi->flags |= GPIOKPF_DEBOUNCE; |
| | 55 | printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags); |
| | 56 | } |
| | 57 | |
| | 58 | old_delay = gpio_evmi->debounce_delay.tv.nsec; |
| | 59 | |
| | 60 | if (gpio_evmi->debounce_delay.tv.nsec != debounce_delay * NSEC_PER_MSEC) { |
| | 61 | printk(KERN_INFO PREFIX "Changing debounce_delay\n"); |
| | 62 | gpio_evmi->debounce_delay.tv.nsec = debounce_delay * NSEC_PER_MSEC; |
| | 63 | printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec); |
| | 64 | } |
| | 65 | |
| | 66 | return 0; |
| | 67 | } |
| | 68 | |
| | 69 | static void __exit debounce_exit(void) |
| | 70 | { |
| | 71 | if (gpio_evmi) { |
| | 72 | if (gpio_evmi->debounce_delay.tv.nsec != old_delay) { |
| | 73 | printk(KERN_INFO PREFIX "Restoring debounce_delay\n"); |
| | 74 | gpio_evmi->debounce_delay.tv.nsec = old_delay; |
| | 75 | printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec); |
| | 76 | } |
| | 77 | } |
| | 78 | } |
| | 79 | |
| | 80 | module_init(debounce_init); |
| | 81 | module_exit(debounce_exit); |
| | 82 | |
| | 83 | MODULE_LICENSE("GPL"); |
| | 84 | MODULE_AUTHOR("Michael Gernoth <michael@gernoth.net>"); |
projects / ms2-fixes / blame_incremental